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根据实测光强 ,利用作物和树木光———光合曲线中的最大光合速率和表观量子效率以及各物候期的叶面积系数 ,叶幕消光系数等参数 ,估算了杨农间作与单一农作物 (对照 )的光能利用率。结果表明 ,三种杨农间作模式的总光能利用率都高于对照 ,约可提高 2 7 5 6 %～ 48 6 4%。间作田农作物的日累积光合量随日累积光量减少而降低 ,呈线性正相关。当相对光强 >6 0 %时 ,间作田农作物的光能利用率稍高于对照田农作物 ;相对光强 <5 0 %时 ,间作田农作物的光能利用率与对照田相似 ,这是因为弱光下 ,农作物呼吸并未减弱引起的。日累积光合量和农作物产量测定表明 ,间作田农作物的加权平均产量与对照田产量的比率与两者日累积光合量的比率相近 ,证明估算方法是可行的
According to the measured light intensity, the maximum photosynthetic rate and apparent quantum yield of photosynthesis curve of crops and trees were used to estimate the leaf area coefficient and leaf extinction coefficient of each phenological stage. Control) of the light energy utilization. The results showed that the total light energy utilization rates of the three intercropping models were all higher than those of the control, which could be increased by about 2765% to 4864%. The daily accumulated photosynthetic rate of intercropping crop decreased with the decrease of daily accumulated light intensity, which showed a linear positive correlation. When the relative light intensity was> 60%, the light utilization efficiency of intercropped field crops was slightly higher than that of the control field crops. When the relative light intensity was less than 50%, the light utilization efficiency of intercropped crops was similar to that of the control field because In low light, crop respiration did not diminish. The daily cumulant photosynthesis and crop yield measurements showed that the ratio of the weighted average yield of intercropped cropland to the control field yield was similar to the ratio of the accumulated photosynthesis rate per day, proving that the estimation method is feasible